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Troubleshooting BGP is not an art, nor a science, it's straightforward methodical verification of each layer of functionality. Skip something and you'll be sitting on the phone for hours with tech support.

  1. Learn TCP/IP and know it COLD
  2. Learn BGP and know it COLD
  3. MEMORIZE the BGP Best Path Selection Algorithm
  4. Know the common causes of Problems
  5. Troubleshooting Techniques
    • Use the appropriate BGP Commands for troubleshooting
      • show ip route
      • show ip bgp (regex)
      • show ip bgp longer-prefixes
      • show ip bgp neighbor
    • Route Servers
      • Memorize a few addreses
      • Use them to check your routes as heard outside your ISP's network.  

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